Sand-discharging self-cleaning filter and self-cleaning method

Abstract

The invention belongs to the technical field of industrial circulating water purification treatment, and particularly relates to a sand-discharging self-cleaning filter and a self-cleaning method. The filter comprises a water inlet, a water outlet, a water inlet cavity, a filtering cavity, a high-precision filtering screen and a sand discharging device, wherein the water inlet is arranged on one side of the water inlet cavity; the water outlet is arranged on one side of the filter; the water inlet cavity is arranged at one end of the filtering cavity; the filtering cavity is arranged inside the filter; the high-precision filtering screen is arranged inside the filtering cavity; the sand discharging device is arranged at the other end of the filtering cavity; and one end of the high-precision filtering screen is communicated with the water inlet cavity, and the other end of the high-precision filtering screen is communicated with the sand discharging device. The sand-discharging self-cleaning filter can avoid the influence to a filtering function caused by a factor that dirt with diameter more than that of the nozzle cannot be sucked into the nozzle and block the filtering screen, and thus the stability of a filtering system can be ensured. Furthermore, the sand-discharging self-cleaning filter is relatively light in weight and convenient to move, and can meet using requirements on different geological conditions.

Description

technical field [0001] The invention belongs to the technical field of industrial circulating water purification treatment, in particular to a sand-discharging self-cleaning filter and a self-cleaning method. Background technique [0002] The filter structure for on-line purification of industrial circulating water is generally as follows: figure 1 Shown is a schematic diagram of the internal structure of an existing industrial circulating water filter. Its working principle is: the raw water is input into the coarse filter chamber 92 from the water inlet 91, the impurities with large particles in the raw water are intercepted by the coarse filter screen 93, and then enters the fine filter chamber 94, and after being further filtered by the fine filter screen 95, the purified water flows from the outlet Water port 96 discharges. After filtering for a certain period of time, a layer of impurities will often accumulate on the inner wall of the fine filter 95, and a gradually...

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Problems solved by technology

[0006] The invention provides a sand-discharging self-cleaning filter and a self-cleaning method, aiming to solve the problem that the existing self-cleaning filter system cannot eliminate the large-diameter dirt that affects the filtering function and is inconvenient to move due to its heavy weight question

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